/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package org.apache.ranger.services.ozone;

import org.apache.commons.lang.StringUtils;
import org.apache.ranger.plugin.client.HadoopException;
import org.apache.ranger.plugin.model.RangerPolicy;
import org.apache.ranger.plugin.model.RangerPolicy.RangerPolicyItem;
import org.apache.ranger.plugin.model.RangerPolicy.RangerPolicyItemAccess;
import org.apache.ranger.plugin.model.RangerService;
import org.apache.ranger.plugin.model.RangerServiceDef;
import org.apache.ranger.plugin.policyengine.RangerPolicyEngine;
import org.apache.ranger.plugin.service.RangerBaseService;
import org.apache.ranger.plugin.service.ResourceLookupContext;
import org.apache.ranger.services.ozone.client.OzoneResourceMgr;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

public class RangerServiceOzone extends RangerBaseService {
    private static final Logger LOG = LoggerFactory.getLogger(RangerServiceOzone.class);

    public static final String ACCESS_TYPE_READ      = "read";
    public static final String ACCESS_TYPE_WRITE     = "write";
    public static final String ACCESS_TYPE_CREATE    = "create";
    public static final String ACCESS_TYPE_LIST      = "list";
    public static final String ACCESS_TYPE_DELETE    = "delete";
    public static final String ACCESS_TYPE_READ_ACL  = "read_acl";
    public static final String ACCESS_TYPE_WRITE_ACL = "write_acl";
    public static final String ACCESS_TYPE_ALL       = "all";

    public RangerServiceOzone() {
        super();
    }

    @Override
    public void init(RangerServiceDef serviceDef, RangerService service) {
        super.init(serviceDef, service);
    }

    @Override
    public Map<String, Object> validateConfig() throws Exception {
        Map<String, Object> ret         = new HashMap<>();
        String              serviceName = getServiceName();

        LOG.debug("<== RangerServiceOzone.validateConfig Service: ({})", serviceName);

        if (configs != null) {
            try {
                ret = OzoneResourceMgr.connectionTest(serviceName, configs);
            } catch (HadoopException e) {
                LOG.error("<== RangerServiceOzone.validateConfig Error: {}", e.getMessage(), e);
                throw e;
            }
        }

        LOG.debug("<== RangerServiceOzone.validateConfig Response : ({})", ret);

        return ret;
    }

    @Override
    public List<String> lookupResource(ResourceLookupContext context) throws Exception {
        List<String>        ret         = new ArrayList<>();
        String              serviceName = getServiceName();
        String              serviceType = getServiceType();
        Map<String, String> configs     = getConfigs();

        LOG.debug("==> RangerServiceOzone.lookupResource Context: ({})", context);

        if (context != null) {
            try {
                ret = OzoneResourceMgr.getOzoneResources(serviceName, serviceType, configs, context);
            } catch (Exception e) {
                LOG.error("<==RangerServiceOzone.lookupResource Error : ", e);
                throw e;
            }
        }

        LOG.debug("<== RangerServiceOzone.lookupResource Response: ({})", ret);

        return ret;
    }

    @Override
    public List<RangerPolicy> getDefaultRangerPolicies() throws Exception {
        LOG.debug("==> RangerServiceOzone.getDefaultRangerPolicies() ");

        List<RangerPolicy> ret = super.getDefaultRangerPolicies();

        for (RangerPolicy defaultPolicy : ret) {
            if (defaultPolicy.getName().startsWith("all")) {
                RangerPolicyItem policyItemOwner = new RangerPolicyItem();

                policyItemOwner.setUsers(Collections.singletonList(RangerPolicyEngine.RESOURCE_OWNER));
                policyItemOwner.setAccesses(Collections.singletonList(new RangerPolicyItemAccess(ACCESS_TYPE_ALL)));
                policyItemOwner.setDelegateAdmin(true);

                defaultPolicy.addPolicyItem(policyItemOwner);

                if (StringUtils.isNotBlank(lookUpUser)) {
                    RangerPolicyItem             policyItemForLookupUser = new RangerPolicyItem();
                    List<RangerPolicyItemAccess> accessListForLookupUser = new ArrayList<>();

                    accessListForLookupUser.add(new RangerPolicyItemAccess(ACCESS_TYPE_READ));
                    accessListForLookupUser.add(new RangerPolicyItemAccess(ACCESS_TYPE_WRITE));
                    accessListForLookupUser.add(new RangerPolicyItemAccess(ACCESS_TYPE_CREATE));
                    accessListForLookupUser.add(new RangerPolicyItemAccess(ACCESS_TYPE_LIST));
                    accessListForLookupUser.add(new RangerPolicyItemAccess(ACCESS_TYPE_DELETE));
                    accessListForLookupUser.add(new RangerPolicyItemAccess(ACCESS_TYPE_READ_ACL));
                    accessListForLookupUser.add(new RangerPolicyItemAccess(ACCESS_TYPE_WRITE_ACL));
                    accessListForLookupUser.add(new RangerPolicyItemAccess(ACCESS_TYPE_ALL));

                    policyItemForLookupUser.setUsers(Collections.singletonList(lookUpUser));
                    policyItemForLookupUser.setAccesses(accessListForLookupUser);
                    policyItemForLookupUser.setDelegateAdmin(false);

                    defaultPolicy.addPolicyItem(policyItemForLookupUser);
                }
            }
        }

        LOG.debug("<== RangerServiceOzone.getDefaultRangerPolicies() : {}", ret);

        return ret;
    }
}
